if: if_init inits the interface from the kernel

src/if-bsd.c

@@ -138,6 +138,13 @@ os_init(void)
 
 int
 if_init(__unused struct interface *iface)
+{
+	/* No extra init needed. */
+	return 0;
+}
+
+int
+if_init_os(__unused struct interface *iface)
 {
 	/* BSD promotes secondary address by default */
 	return 0;

src/if-linux.c

@@ -299,6 +299,33 @@ if_writepathuint(struct dhcpcd_ctx *ctx, const char *path, unsigned int val)
 
 int
 if_init(struct interface *ifp)
+{
+	struct dhcpcd_ctx *ctx = ifp->ctx;
+	struct ifreq ifr = { .ifr_flags = 0 };
+	int err = 0;
+
+	if (ifp->index != 0)
+		return 0;
+
+	/* This is a huge bug in getifaddrs(3) as there
+	 * is no reason why this can't be returned in
+	 * ifa_addr. */
+	strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name));
+	if (ioctl(ctx->pf_inet_fd, SIOCGIFHWADDR, &ifr) == -1) {
+		logerr("%s: SIOCGIFHWADDR", ifp->name);
+		err = -1;
+	} else
+		ifp->hwtype = ifr.ifr_hwaddr.sa_family;
+	if (ioctl(ctx->pf_inet_fd, SIOCGIFINDEX, &ifr) == -1) {
+		logerr("%s: SIOCGIFINDEX", ifp->name);
+		err = -1;
+	} else
+		ifp->index = (unsigned int)ifr.ifr_ifindex;
+	return err;
+}
+
+int
+if_init_os(struct interface *ifp)
 {
 	char path[sizeof(PROC_PROMOTE) + IF_NAMESIZE];
 	int n;

src/if-sun.c

@@ -116,6 +116,12 @@ os_init(void)
 
 int
 if_init(struct interface *ifp)
+{
+	return 0;
+}
+
+int
+if_init_os(struct interface *ifp)
 {
 #ifdef INET
 	if (if_plumb(RTM_NEWADDR, ifp->ctx, AF_INET, ifp->name) == -1 &&

src/if.c

@@ -400,15 +400,17 @@ if_valid_hwaddr(const uint8_t *hwaddr, size_t hwlen)
 	return false;
 }
 
-#if defined(AF_PACKET) && !defined(AF_LINK)
+#ifndef AF_LINK
 static unsigned int
 if_check_arphrd(struct interface *ifp, unsigned int active, bool if_noconf)
 {
 	switch (ifp->hwtype) {
+#ifdef ARPHRD_NONE
+	case ARPHRD_NONE: /* FALLTHROUGH */
+#endif
 	case ARPHRD_ETHER:	/* FALLTHROUGH */
 	case ARPHRD_IEEE1394:	/* FALLTHROUGH */
 	case ARPHRD_INFINIBAND: /* FALLTHROUGH */
-	case ARPHRD_NONE:	/* FALLTHROUGH */
 		break;
 	case ARPHRD_LOOPBACK:
 	case ARPHRD_PPP:
@@ -659,32 +661,22 @@ if_discover(struct dhcpcd_ctx *ctx, struct ifaddrs **ifaddrs, int argc,
 			ifp->hwlen = sll->sll_halen;
 			if (ifp->hwlen != 0)
 				memcpy(ifp->hwaddr, sll->sll_addr, ifp->hwlen);
-			active = if_check_arphrd(ifp, active, if_noconf);
 #endif
 		}
-#ifdef __linux__
-		else {
-			struct ifreq ifr = { .ifr_flags = 0 };
-
-			/* This is a huge bug in getifaddrs(3) as there
-			 * is no reason why this can't be returned in
-			 * ifa_addr. */
-			strlcpy(ifr.ifr_name, ifa->ifa_name,
-			    sizeof(ifr.ifr_name));
-			if (ioctl(ctx->pf_inet_fd, SIOCGIFHWADDR, &ifr) == -1)
-				logerr("%s: SIOCGIFHWADDR", ifa->ifa_name);
-			ifp->hwtype = ifr.ifr_hwaddr.sa_family;
-			if (ioctl(ctx->pf_inet_fd, SIOCGIFINDEX, &ifr) == -1)
-				logerr("%s: SIOCGIFINDEX", ifa->ifa_name);
-			ifp->index = (unsigned int)ifr.ifr_ifindex;
-			if_check_arphrd(ifp, active, if_noconf);
+
+		if (if_init(ifp) == -1) {
+			logerr("%s: if_init", ifp->name);
+			if_free(ifp);
+			continue;
 		}
+#ifndef AF_LINK
+		active = if_check_arphrd(ifp, active, if_noconf);
 #endif
 
 		if (!(ctx->options & (DHCPCD_DUMPLEASE | DHCPCD_TEST))) {
 			/* Handle any platform init for the interface */
-			if (active != IF_INACTIVE && if_init(ifp) == -1) {
-				logerr("%s: if_init", ifp->name);
+			if (active != IF_INACTIVE && if_init_os(ifp) == -1) {
+				logerr("%s: if_init_os", ifp->name);
 				if_free(ifp);
 				continue;
 			}

src/if.h

@@ -206,8 +206,9 @@ int if_nametospec(const char *, struct if_spec *);
 
 /* The below functions are provided by if-KERNEL.c */
 int os_init(void);
-int if_conf(struct interface *);
-int if_init(struct interface *);
+int if_init(struct interface *);    /* init interface from kernel */
+int if_init_os(struct interface *); /* init kernel from interface */
+int if_conf(struct interface *);    /* finish configuration from kernel */
 int if_getssid(struct interface *);
 int if_ignoregroup(int, const char *);
 bool if_ignore(struct dhcpcd_ctx *, const char *);